EXP 19 data

I calculated velocity by the mean 'ds / vertical time. (0.2422/0.384389258)=0.630090448" "Conservation of Momentum Large Ball No Collision DS1 DS2 DS3 DS4 DS5 0.154 0.146 0.158 0.153 0.158 0.1538 0.383325939 0.401225131 V Height(m) DS1 DS2 DS3 DS4 DS5 Mean Vertical Time Horizontal Velocity small B 0.724 0.249 0.238 0.239 0.243 0.242 0.2422 0.384389258 0.630090448 large B 0.72 0.16 0.161 0.163 0.164 0.161 0.1618 0.383325939 0.442965066

Those data are consistent with your results. You analysis is flawless; I still can't imagine how the distances for the large ball after collision exceeded those obtained when the balls didn't collide. Not that I don't believe it--you have demonstrated very good experimental skills and understanding and I trust your measurements.
Let me know if you have any ideas, but otherwise you can move on to subsequent experiments.